It was discovered that the ICU unicode library performed incorrect processing of invalid multibyte sequences, resulting in potential bypass of security mechanisms. For the old stable distribution , this problem has been fixed in version 3.6-2etch3. For the stable distribution , this problem has been fixed in version 3.8.1-3+lenny2. For the unstable distribution , this problem has been fixed in version 4.0.1-1. We recommend that you upgrade your icu packages.